The SDL Component Suite is an industry leading collection of components supporting scientific and engineering computing. Please visit the SDL Web site for more information....


Home GeoPack GeoBasics Procedures and Functions GeoEllEccSquared
See also: RecipFlattening, EllipsoidMinAxEcc 

GeoEllEccSquared

Unit: SDL_geobasics
Class: none
Declaration: [1] function GeoEllEccSquared (Ellipsoid: TGeoEllipsoid): double;
[2] function GeoEllEccSquared (SemiMajorAx, SemiMinorAx: double): double;
[3] function GeoEllEccSquared (RecipFlattening: double): double;

The function GeoEllEccSquared calculates the squared eccentricity e2 of an ellipsoid:

e2 = 1 - b2/a2

with a = semimajor axis, and b = semiminor axis.

Version [1] calculates it from the ellipsoid given by the parameter Ellipsoid, version [2] calculates the eccentricity from the lengths of the semimajor and semiminor axes (parameters SemiMajorAx and SemiMinorAx), and version [3] calculates it from the reciprocal flattening.

Hint: An infinite reciprocal flattening passed to the function in the parameter RecipFlattening has to be indicated by setting RecipFlattening to a zero value.


Last Update: 2023-Feb-06